A protestor holds a sign that reads 'Varoufakis Game Over' during a pro European Union (EU) demonstration at Agia Sofia Square in Thessaloniki, Greece, on Thursday, July 2, 2015. Greek Prime Minister Alexis Tsipras and his creditors sparred heading into Sunday's referendum on austerity as a poll suggested voters are inclined to accept deeper cuts. Photographer: Konstantinos Tsakalidis/Bloomberg via Getty Images
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